129 lines
4.5 KiB
Nix
129 lines
4.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.programs.captive-browser;
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in
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{
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###### interface
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options = {
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programs.captive-browser = {
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enable = mkEnableOption "captive browser";
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package = mkOption {
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type = types.package;
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default = pkgs.captive-browser;
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defaultText = "pkgs.captive-browser";
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description = "Which package to use for captive-browser";
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};
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interface = mkOption {
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type = types.str;
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description = "your public network interface (wlp3s0, wlan0, eth0, ...)";
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};
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# the options below are the same as in "captive-browser.toml"
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browser = mkOption {
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type = types.str;
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default = concatStringsSep " " [
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''env XDG_CONFIG_HOME="$PREV_CONFIG_HOME"''
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''${pkgs.chromium}/bin/chromium''
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''--user-data-dir=''${XDG_DATA_HOME:-$HOME/.local/share}/chromium-captive''
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''--proxy-server="socks5://$PROXY"''
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''--host-resolver-rules="MAP * ~NOTFOUND , EXCLUDE localhost"''
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''--no-first-run''
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''--new-window''
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''--incognito''
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''-no-default-browser-check''
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''http://cache.nixos.org/''
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];
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description = ''
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The shell (/bin/sh) command executed once the proxy starts.
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When browser exits, the proxy exits. An extra env var PROXY is available.
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Here, we use a separate Chrome instance in Incognito mode, so that
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it can run (and be waited for) alongside the default one, and that
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it maintains no state across runs. To configure this browser open a
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normal window in it, settings will be preserved.
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@volth: chromium is to open a plain HTTP (not HTTPS nor redirect to HTTPS!) website.
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upstream uses http://example.com but I have seen captive portals whose DNS server resolves "example.com" to 127.0.0.1
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'';
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};
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dhcp-dns = mkOption {
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type = types.str;
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description = ''
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The shell (/bin/sh) command executed to obtain the DHCP
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DNS server address. The first match of an IPv4 regex is used.
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IPv4 only, because let's be real, it's a captive portal.
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'';
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};
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socks5-addr = mkOption {
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type = types.str;
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default = "localhost:1666";
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description = "the listen address for the SOCKS5 proxy server";
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};
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bindInterface = mkOption {
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default = true;
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type = types.bool;
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description = ''
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Binds <package>captive-browser</package> to the network interface declared in
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<literal>cfg.interface</literal>. This can be used to avoid collisions
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with private subnets.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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programs.captive-browser.dhcp-dns =
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let
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iface = prefixes:
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optionalString cfg.bindInterface (escapeShellArgs (prefixes ++ [ cfg.interface ]));
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in
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mkOptionDefault (
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if config.networking.networkmanager.enable then
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"${pkgs.networkmanager}/bin/nmcli dev show ${iface []} | ${pkgs.gnugrep}/bin/fgrep IP4.DNS"
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else if config.networking.dhcpcd.enable then
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"${pkgs.dhcpcd}/bin/dhcpcd ${iface ["-U"]} | ${pkgs.gnugrep}/bin/fgrep domain_name_servers"
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else if config.networking.useNetworkd then
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"${cfg.package}/bin/systemd-networkd-dns ${iface []}"
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else
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"${config.security.wrapperDir}/udhcpc --quit --now -f ${iface ["-i"]} -O dns --script ${
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pkgs.writeShellScript "udhcp-script" ''
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if [ "$1" = bound ]; then
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echo "$dns"
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fi
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''}"
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);
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security.wrappers.udhcpc = {
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capabilities = "cap_net_raw+p";
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source = "${pkgs.busybox}/bin/udhcpc";
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};
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security.wrappers.captive-browser = {
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capabilities = "cap_net_raw+p";
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source = pkgs.writeShellScript "captive-browser" ''
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export PREV_CONFIG_HOME="$XDG_CONFIG_HOME"
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export XDG_CONFIG_HOME=${pkgs.writeTextDir "captive-browser.toml" ''
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browser = """${cfg.browser}"""
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dhcp-dns = """${cfg.dhcp-dns}"""
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socks5-addr = """${cfg.socks5-addr}"""
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${optionalString cfg.bindInterface ''
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bind-device = """${cfg.interface}"""
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''}
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''}
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exec ${cfg.package}/bin/captive-browser
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'';
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};
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};
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}
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